Grinding-mill



3 Sheets-Sheet 1.

(No Model.)

S. HUGHES. GRINDING MILL.

No. 438,729. Patented 001;. 21, 1890..

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S. HUGHES. GRINDING MILL.

(No Model.)

No. 438,729. Patented oct. 211, 1890.

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(No Model.) 3 Sheets-Sheet 3.

s. HUGHES( GRINDING MILL.

No. 438,729. Patented 0015.21, 1890.

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T i I I IFTA IJ- I I l 391!" l l-a UNITED STATES PATENT EEICE.

SAMUEL HUGHES, OF CHARLESTON, SOUTH CAROLINA.l

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 438,729, dated October21, 1890.

Application filed July 22,1890. Serial No. 359,530. (No model.)

. being to produce a mill of the class mentioned,

the rolls of which shall act by centrifugal force against a circular dieand have a positive rotary motion imparted to them.

With this object in View the invention consists in certain novelfeatures of construction and combinations and arrangements of parts, ashereinafter set forth, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a sectional View of myimproved mill. Fig. 2 is a View partly in section showing the frameworkfor supporting the mill, the mill being shown constructed andparticularly adapted' for grinding gritty substances. Fig. 3 is a planView of the mill with the supportingframe removed. Fig. et is a view inside elevation of the bottom driver. Fig. 5 is a plan view of the same.Fig. 6 is a plan view of the cross-bar carrying the stirrers. Fig. 7 isa side View of the same.

The main frame of the apparatus is composed of base or supportingtimbers A, uprights B, connecting-timbers C, and timbers D. Located inthe main frame and having a ange a, adapted to rest on the base-timbersA, is a recept-acle 1, provided interiorly with a shoulder b, upon whichan annular die 2 is',

located. Secured upon the receptacle 1 is an annular ring 3, adapted toproduce a chamber 4, said annular ring being provided at its top andbottom with flanges c d, the ange c being secured to the walls of thereceptacle 1, and the upper flange d having a circular plate 5 boltedthereto, as shown in Fig. 1. The

plate 5 is provided in proximity to its periphery with adownwardly-projecting flange f, adapted to extend preferably somewhatbelow the fiange cl of ring 3. Fixed at its upper edge to the flange fof the plate 5 and at its lower edge to the flange c of ring 3 is a band6, of sheet metal or other suitable material, thus forming a space orchamber 7, surrounding the band 3, which latter is provided throughoutits circumference with a series of openings covered with suitablescreening material,whereby a series of screens g is produced, throughwhich powdered material may pass into the chamber 7, as presentlyexplained. Two hoppers 8, having inclined bottoms, communicate withthe/chamber 7 for the reception of powdered material, said materialbeing conveyed from the mill by means of a chute or chutes 9communicating with said hoppers.

In the drawings I have shown two hoppers and spouts; but it is evidentthat a greater number may be employed, if desired. The plate 5 isprovided interiorly with an upwardly-projecting annular flange h, towhich a band 10 is secured, and produces the upper portion of the casingof the mill.

While the construction of the casing as above described is convenient,it is evident that said casing may be varied to any desired extentwithout affecting theA scope of my invention.

Located upon the timbers D and having a depending flange D', which isbolted to the band 10, is an annular gear-band E, provided on itsinterior face with a series of gear-teeth F, for a purpose that will beexplained farther on.

Passing vertically through the cross-bars C of the main frame andjournaled in suitable boxes 11 on said cross-bars is a vertical shaft12, said shaft being provided at points above the cross bars withadjustable collars 13, adapted to bear on the cross-bars or thejournal-boxes secured thereto and maintain said shafts in properposition.

Secured to the shaft 12 at a point in close proximity tothe top of themill is a top driver 14, from which two shafts 15, carrying rolls 16,are suspended, as presently explained. The driver 111 is provided at itscenter with a perforated boss 16, through which the main shaft 12 passesand terminates at its lower end at a point in proximity to the pan orreceptacle 1. A cross-bar 18, provided centrally with a perforated boss19, is placed on IOO the lower end of the main shaft 12 and adapted tobe adjustable thereon, a set-screw 12n being passed through said boss toengage the shaft whereby to secure said cross-bar in a fixed position.Made in the cross-bar 18 in proximity to its ends are elongated slotst', and to the under face of said bar the ilanges '1l' of stirrers 2Oare located, said stirrers being bent outwardly at their lower ends andterminating in the receptacle at points below the annular die 2. Thestirrers 20 are secured in position by means of suitable bolts j, whichpass through the flanges t" of the stirrers and through the elongatedslots t in the cross-bar, the heads of said bolts being seated uponsuitable washers j. Thus it will be seen that the stirrers 2O are adjustably secured to the crossbar. Curved stirrers 21 ,are secured to thebottom faces of the roll 16, and projecting downwardly therefrom act inconjunction with the stirrers 2O to keep the material in the panthoroughly agitated.

Thetop driver 14 is provided at opposite sides of the perforated boss1Ga with journalboxes 23 23 24 24 for the reception of thejournals ortrunnions 25 of sleeve 26. The upper ends of the shafts 15 are passedthrough the upper driver 14 between the j ournal-boXes 23 23 24 24,respectively, and through the sleeves 26, said shafts being provided atornear their upper ends with collars 27, which are ad justably securedto said shafts by means of set-screws 23, the lower ends of said collarsbeing adapted to rest upon the upper ends of the oscillating sleeves 26.

Keyed to the shaft 15 at points beneath the driver 14 are gear-wheels G,preferably of smaller size than the rollers 16, said gearwheels G beingadapted to mesh with the gear-band or internal gear E, and thus causethe rollers 1G to be rotated positively whenV the mill is operated. Bythis means the rolls, besides simply rolling on the die, will have aslipping action, thereby giving to the mill an additional grindingaction.

At a point near the lower ends of the oscillating shafts 15 and inproximity to the grinding-rolls 1G said oscillatory shafts are connectedwith the main shaft by means 0f a bottom driver 29. The driver 29 may beconveniently made, as shown in Figs. 4 and 5, in which figures 30 31represent two side plates, each provided with a semicircular iiange 3233, which together produce a collar adapted to encircle the main shaft12, the flange 32 being provided with a recess 34 for the reception of akey by means of which to secure the driver to the main shaft. The sideplates 30 31 are connected at their ends by means of bolts 35, saidplates being maintained at suitable distances apart by means of sleeves3G, located between them and encircling the bolts 35. The plates 30 31are connected at their center and clamped to the main shaft by means ofbolts 37.

In the spaces between the bolts 35 and 37 boxes 3S are located, whichboxes may be made in two parts, as shown in Fig. 5, and provided intheir opposing faces with recesses 39 for the reception of plates 30 31,and said boxes are permitted to have a sliding movement between saidplates. The sliding boxes 33 embrace the oscillatory shafts 15, or, moreproperly speaking, wearing-collars 40, fitted on said shafts. By thisconstruction the driver 29 may be readily removed when the parts wear,and the worn plates easily and quickly replaced by new ones.

By the employment of the driver 29, located and connected to the shafts,as above described, all strain will be removed from the pivotal bearingsof the oscillatory shafts 15, permitting them to vibrate freely,preventing the rolls from lagging or swinging backward when gyratedwithin and against the circular die 2, and will prevent the rollers fromrunning ahead and drawing the roller-shafts out of their properpositions, which latter might be occasioned when the roller-shafts arerotated positively were this lower driver 29 not provided. It will bereadily seen that without the employment of a driver located as thedriver 29 is located freedom of action of the rolls cannotbe obtained,forthe reason that the rolls, being forcibly held against the ring-die,will be retarded to a great extent and a sidewise strain brought to bearupon the pivotal bearings overhead, thus hindering free vibration and toa certain extent checking the rolls. A fan 41, made preferably Vof sheetmetal, having its vanes projecting upwardly, is secured to and projectsfrom the upper driver 14 and revolves with it. One-half of the fan 41being on each side of the driver 14, the whole fan forms a top or coverfor the mill.

The rock or other material to be ground is introduced into the millthrough a suitable spout 42 above the screens, and after beingpulverized by the rolls 16 in an obvious manner passes through thescreens into the space or chamber 7, and finally discharged over theinclined bottom of the hoppers S and through the spouts 9. Any approvedmeans may be employed for feeding material to and conveying it from themill. During the passage of the material through the mill the fan 41will operate to blow the dust or pulverized material through the screensinto the space 7 and then to the hoppers 8 or other suitable conveyer.The fan 41 being located at the top of the mill, it will prevent thedust or pulverized material from rising to the pivotal bearings and fromescaping at the top of the mill.

The mill, as shown in Fig. 2, is particularly adapted for pulverizinggritty material. In this form of the invention the bottom driver islocated at a point above the screens instead of in line therewith, asshown in Fig. 1, and j ust below this driver a disk-fan 43 is located,being secured to afian ged collar 44, secured to the main shaft 12.lVhen the lower fan 43 is employed, the upper fan serves to force airIOO IIO

down into the mill, and at the same time is useful as a cover to themill, as previously eX- plained, While the lower fan protects the boxesof -the lower driver from the gritty material being pulverized.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. In a grindingmill, the combination, With a receptacle and a dietherein, of a main rev- ,oluble shaft, oscillatory roller-shaftsconnected with the main shaft, gear-wheels on said oscillatory shafts,an annular gear-band with internal gear-teeth against which thegear-Wheels operate, and rollers carried by said roller-shafts,substantially as set forth.

2. In a grinding-mill, the combination, with a receptacle and a dietherein, of a main revoluble shaft, a driver. carried thereby,oscillatory roller-shafts carried by said driver, rollers carried bysaid oscillatory shafts, a fan carried by the driver, and mechanism forpositively revolving said oscillatory shafts, substantially as setforth.

3. In a grinding-mill, the combination, with a receptacle and a dietherein, of a main revoluble shaft, an upper driver carried bythe mainshaft, oscillatory roller-shafts carried by said driver, rolls carriedby said oscillatory shafts, a driver connecting the main shaft with theoscillatory roller shafts at points in proximity to the rollers,gear-Wheels on the oscillatory shafts, and an annular gearband againstwhich said wheels operate, substantially as set forth.

4. In a grinding-mill, the combination, with ing Witnesses.

SAML. HUGHES. Vitnesses:

W. B. S. WHALEY, W. F. TAYLOR.

